Updated mediawiki/extensions
Project: mediawiki/extensions/BetaFeatures  ba560869d828c93cd087de423a3c45e56f324b60

Remove preference prefix string

Preferences should belong to the extensions they control as
they don't necessarily want to be dependent on the BetaFeatures
extensions to control them.

Change-Id: Id510b2e874920ea222f7717accca2c5956a4e9c3